Well, It Might Help If You Used TempAR's Coding System. Your Using CWcheats Coding.
In TempAR's System, The Codeing Uses "_M" To Replace "_L"
You Could Try That And See Where It Gets You.
I didn't know they made an MSU cart for the Genesis.... I knew about the SNES one and the library for that is rather large but the Genesis one has very few games